A lot of the government of East Germany is still in the government business , but they had useable skill, do the people of the government of NKorea feel as if they could compete ?
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I really doubt that this is true. A huge number of East Germans in all parts of society worked for the Stasi, the secret police. After unification, the list of former Stasi was published. Most of them were simply given small pensions and retired, as no one would hire them. They have skills, perhaps, but those they have would be mostly unusable in South Korea.
What I was saying is that there are a very limited number of professional sport players. The supply is always greater than the demand. The football players would not likely be hired to join the professional rugby teams and would not get the necessary training. There is only a short time during which anyone can play most pro sports.
The fact is that the Generals have it better than everyone in the DPRK, and if unification were to occur, they would lose status immediately, as as all the many atrocities perpetuated by the Kim government in which they collaborated became public, they would come to be loathed quite deeply by everyone. Something like this occurred in East Germany.
The West German politicians that supported unification mostly did not last beyond the next election afterwards. The same would likely happen in Korea.
Imagine what would happen if the US were to merge with a Canada with 150 million people to the political class here and in Canada. New people would emerge to replace those who failed to adapt to the many changes.
As for the North Koreans doing this out of patriotism or charity, I really doubt this would happen.
I do think that Korea will be united someday, but it will cause radical changes and several years of disorder and chaos as well as politically, culturally and economically. It is almost a sure thing that most politicians on both sides will lose out unless they are very adept and clever (as were Yeltsin and Putin).